Engine out practice

"Morgans" wrote

At least that is my take on what they say.

I should have added that the cylinders heating up faster, on start up,
than the pistons would increase the tolerances, and thus cause no scuffing.
--
Jim in NC

Morgans wrote:
"Morgans" wrote

At least that is my take on what they say.

I should have added that the cylinders heating up faster, on start up,
than the pistons would increase the tolerances, and thus cause no scuffing.

Why would the cylinders heat up faster? Only the very top of the
cylinder is in constant contact with the combustion heat whereas the top
of the piston is entirely in contact. As you go down the cylinder away
from the head, the cylinder spends less and less time in contact with
the combustion heat and thus will be cooler.

Matt

"Matt Whiting" wrote

Why would the cylinders heat up faster? Only the very top of the cylinder
is in constant contact with the combustion heat whereas the top of the
piston is entirely in contact. As you go down the cylinder away from the
head, the cylinder spends less and less time in contact with the
combustion heat and thus will be cooler.

Perhaps they would not. I was going simply on the converse.

My thought is that the cold oil shooting on the piston, and a relatively
weak combustion would keep the piston cooler.
--
Jim in NC